mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to troubleshoot a…
A network engineer runs the following command to troubleshoot a Device Access Control issue:
R1# show policy-map control-plane input class class-default
Class-map: class-default (match-any) 140225 packets, 12345678 bytes 5 minute offered rate 1000 bps, drop rate 0 bps Match: any police: cir 1000000 bps, bc 31250 bytes conformed 140225 packets, 12345678 bytes; actions: transmit exceeded 0 packets, 0 bytes; actions: drop violated 0 packets, 0 bytes; actions: drop
What does this output indicate?
⚠ Common exam trap
Cisco often tests the interpretation of police counters in CoPP output, where candidates mistakenly think that a police configuration always drops traffic or that class-default does not match traffic, when in fact the counters clearly show conformed packets and zero drops.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The CoPP policy is policing traffic to 1 Mbps, and all traffic so far has been within the limit and transmitted.
The output shows that the class-default class in the CoPP policy has a police configuration with a CIR of 1,000,000 bps (1 Mbps). All 140,225 packets have been counted as conforming, with zero exceeded or violated packets, and the conform action is 'transmit'. This means all traffic has been within the policed rate and has been forwarded without drops.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The CoPP policy is policing traffic to 1 Mbps, and all traffic so far has been within the limit and transmitted.
Why this is correct
The conformed counter matches the total packets, and exceeded/violated counters are zero, meaning no drops.
- ✗
The CoPP policy is dropping all traffic because the CIR is too low.
Why it's wrong here
No packets have been dropped; the drop rate is 0 bps.
- ✗
The CoPP policy is not matching any traffic because the class-default does not match any packets.
Why it's wrong here
The class-default matches all traffic by default; the packet count shows it has matched 140225 packets.
- ✗
The CoPP policy is only policing traffic that exceeds the CIR, but all traffic is being transmitted.
Why it's wrong here
The policer applies to all traffic; conformed traffic is transmitted, exceeded/violated traffic is dropped. Since all traffic conformed, no drops occurred.
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Written by Johnson Ajibi, MSc IT Security
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